<html>
	<head>
		<meta charset="utf-8" />
		<title>studying knowledge needs thinking again and again</title>
	</head>
	<body>
		
	</body>
	<script type="text/javascript">
		var initial = function() {
			//console.log(1);
			return 1;
		}();
		alert(initial);//这里其实就是接收返回值,没有返回值就是undefined

		function show (){
			const a = 3.14;
		}
		alert(show);//这里返回的就是函数体
	</script>
</html>